These pretty, purple perennials are resilient and cold-hardy. Mexican petunias are fast-growing plants native to warm parts of South America and Mexico, but they can tolerate cool temperatures in ...
A: A broadleafed weedkiller (containing 2,4-D) will kill a certain portion of them, but at some point, you may just decide to rototill deeply and rake out as much of the root system as you can.
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